Centrifugal compressor.



L H. lVlcFARLAND-.

CENTRIFUGAL COMPRESSOR. APPLICATION mu) APR.9. 1911.

EdWa

Patented Apr. 23, 1918;

Invenbdr,

rd H. [We arlandw mm 1:: t immanent, or SCHJENJEGTADY, new roan, nssren'on ntucrnrcconran'r, a coona'rron or new row It remarr ed-an COMPRESSOR.

To all whom it may concern Be it known that T, EnwAno MGFAR- LAND, a citizen of the United States, residing at Schenectady, inthe county of Schenectady, State of New York, have invented certain new and useful Improvements in Centrifugal Compressors, of which the following is a specification.

The present invention relates to' centrifugal compressors, and particularly to' the im ellers for such machines. a

no object of the inventionis to provide an improved method of manufacturing the bladesof impellers wherein the same areformed from I-beams in a simple and ef ficient manner. I

Another object of the invention is to provide an improved impeller which. readily .lends itself to being constructed. from blades formed from I-beams according to my improved. method.

. For a consideration'of what I believe totaken on line 2-2 Fig. 1; Fig. 3 is a per-- spectivewiew of one of the impeller blades; Fig. 4: isa view illustrating the method of makin the blades from anT-beam, and Fig.

' 5 is'a section of an ll-beam. 35

Referring to the drawing, Fig. 1, there is hereshown a length of I-beam comprising the usual web 6=and flanges 7. From this length two blades for an impeller wheel are formed- To this end theT-beam is first the flange 7 left on the one side of the web.

The portion of the web outside the dotted line c is then removed from each section and the end of the flange at this pointis then heated and upset toform a ridge 8, as shown in Fig. 3. .By this method I form from a suitable length of T-beam two impeller blades. The flanges 7 of the'T-bea-m become the blades proper, which blades are indicated at 9in Figs. .1, 2, and 3. The portions of the web 6 left integral with the Speolfloation of letters Patent.

Application filed April 9, 1917. I Serial No. 180,722. q

p 1 till;

9. Y m amine atented a as, lei.

flanges becomebraces IO for siipporting I and stiflening the blades and guarding if against their bending in a transverse plane.

As is clear from the drawingyeach brace 10 is widest and hence stron'ges t at its inner end or rootand gradually tapers outward toward the tip of the impeller vanes.

It thus provides the greatest strength atthe inner end of theblade where the centrifugal jstresses are the greatest. The blades 9 may besuitably'tapered by cutting them away on the two edges, as indicated in Fig.

2, to give them the desired shape. In Fig. 2 the. dotted lines show-the amount of material which has been removedfrom the two edges of the blade 9. By the above described method it will be seen that I construct the impeller blades from ordinary T-beams in a very simple manner, and since rolled I-beams can be readily obtained in the open market the result is a very cheap method for forming the blades.

After. being formed the blades may be fastened to a hub to form the assembled impeller. any suitable manner, as, for example by casting a hub around their inner ends. preferably, however, provide a *hub comprising two parts 11 and 12 between and-in which the'roots of theblades are fastened. The two parts are provided with alined' undercut slots 13 which receive. the

ridges 8 and'the adjacentportions of the blades, and also with annular flanges 14 and 15 between which the braces 10 are held.

The two parts 11 and 12 are held together shoulder 18 on part 12, thus forming a rabr beted joint between the two parts. In as:

sembling the impeller the blades arefirst slipped into the slots 13 in part 11 of the hub, the braces 10 taking against the annular flange 14. The part 12 is then put into position, the necessary holes bored, and

therivets or bolts'16 inserted and fastened.

By this arrangement the blades are very firmlyanchored'in the hubs. At the same time, the structure is comparatively. cheap to build and easy to assemble. rthermore the centrifugal stresses in the hub will V not be great as the rotor toward the periphery is comparatively light.

The direction of rotation is thatindicated by the arrow in Fig. 1, and it-will be noted that the braces are on the backs oi the blades, leaving the faces smooth for theunobstructed passage of the fluid being handled.

I In accordance with theprovisions of the patent statutes, I have described the principle of operation of my invention, to ether wlth the apparatus which I now consi er to represent the best embodiment thereof; but

I desire tohave it understood that the appa ratus shown is only'illustrative, and that the 4 invention can be carried out by other means.

What I claim as new 'and desire to secure by Letters Patent of the United States, is 1- 1. The method of forming impeller blades which comprises taking a suitable length of I-beam and cutting it diagonally across its Web 2. The method of forming impeller blades i which comprises taking a suitable length of I-beam and cutting it diagonally across its web from a-point on one side and slightly spaced from one end to a point on the opposite side and slightly spaced from the other end.

3. The method of forming impeller blades each part at the end where the web is wrdest, and upsetting the flange at the point where the web is removed.

The method of forming an impeller which comprises taking suitable lengths of I-beam, cutting them diagonally across their webs, and mountin them around a hub in such position thatlt e flanges of the I-beam are utilized as the blades and the webs are utilized as braces. 1

5. In an impeller, the combination of a hub comprising two rings, having slots therein, and blades havin their inner ends located in the slots, said lades being provided with braces which extend longitudinally thereof and have their inner ends clamped between said rings.

6. In an impeller, the combination of a hub comprising two rings provided with undercut slots,and blades having their inner ends located in and shaped to fit said slots, said blades being provided with braces which extend longitudinally thereof and have their inner ends clamped between said rings.

In witness whereof, I'have hereunto set my hand this fifth day of April, 1917.

- EDWARD H..MOFARLAND. 

